Mobil Pegasus™ 805

Mobil industrial , Uruguay

Gas Engine Oil

Product Description

Mobil Pegasus™ 805 is premium performance gas engine oil engineered to meet the rigorous demands of today's high output four-cycle engines designed to reduce emissions and improve fuel-efficiency. These gas engines generally operate under high load and high temperature conditions. Mobil Pegasus 805 is made from high quality base stocks and an advanced technology additive system that provides exceptional oxidation stability, nitration resistance and thermal stability. Its detergent and dispersant system controls the formation of carbon deposits, lacquer and sludge resulting in cleaner engines, longer oil life and reduced filter costs.


Mobil Pegasus 805 is also designed to provide exceptional protection against piston scuffing, scoring and ring and liner wear. It exhibits excellent resistance to foaming, good demulsibility and protection against corrosion. It is formulated with very low levels of zinc and phosphorus making it compatible with engines equipped with catalytic converters.


Features and Benefits

Mobil Pegasus 805 is designed to provide optimum engine life and low maintenance costs. It meets a wide range of OEM requirements making it an excellent choice where high-speed four-cycle engines from various OEMs are used. Its unique innovative technology allows for control of valve train component wear and reduces the potential for scuffing, scoring and accelerated piston and ring wear. The end result is lower costs of operating and maintaining your gas engines.



Advantages and Potential Benefits

Exceptional Oxidation and Nitration Resistance

Cleaner engines

Longer oil and filter service

Improved engine performance

Outstanding Anti-wear and Anti-scuff protection

Reduced scoring, scuffing and wear of pistons and liners

High level of protection in fully loaded engines

Reduced maintenance costs

Advanced Technology Additive System

Excellent protection of valve train components

Reduced levels of combustion chamber ash

Improved spark plug life

Very Effective Corrosion Protection

Protects internal engine components from water, coolant and acidic materials

Neutralizes acids formed from combustion or oil degradation

Excellent Detergent / Dispersancy Performance

Protects valve train components

Reduces ash and carbon deposits in combustion chambers

Improves spark plug life and performance

Reduces filter replacement costs



     •  Caterpillar, Superior, Waukesha and other turbocharged, naturallyspirated, medium to high speed four-cycle engines requiring a low ash oil

     •  Engines experiencing valve face and seat wear

     •  Lean-burn and stoichiometric four-cycle engines

     •  Engines equipped with catalytic converters

     •  Applications using alternate fuels containing low levels of sulfur or chlorine

     •  In field gathering operations where sour gas (low levels of H2S) is used as fuel


Specifications and Approvals

This product has the following approvals:

Caterpillar Energy Solutions TR 2105, Lube Oils for Gas Engines (CG132, CG170, CG260)

INNIO Jenbacher TI 1000-1109 (Class A fuel gas, Type 2, 3, 4 & 6)

INNIO Jenbacher TI 1000-1109 (Class B fuel gas, Type 4 & 6)

INNIO Waukesha Engine 220GL Applications Using Pipeline Quality Gas

INNIO Waukesha Engine Cogeneration / Gas Compression Applications Using Pipeline Quality Gas

MAN Energy Solutions Augsburg (Heritage MAN B&W) 4 Stroke medium speed engines for LNG operation

MTU Gas Engines S4000 L32, L33 using natural gas

MWM TR 0199-99-2105, Lube Oils for Gas Engines


Wartsila 220SG

Wartsila 28SG

Wartsila 32DF

Wartsila 34SG

Rolls-Royce Solutions Augsburg (former MTU Onsite Energy) Gas Engines Series 400 - all engines with natural gas and propane gas

INNIO Jenbacher TI 1000-1109 (Class C fuel gas, Type 4A, 4B & 4C)

MTU Gas Engines S4000 L61, L62, L63 using natural gas


This product meets or exceeds the requirements of:


Properties and Specifications




SAE 40

Ash, Sulfated, mass%, ASTM D874


Flash Point, Cleveland Open Cup, °C, ASTM D92


Kinematic Viscosity @ 100 C, mm2/s, ASTM D445


Kinematic Viscosity @ 40 C, mm2/s, ASTM D445


Pour Point, °C, ASTM D97


Viscosity Index, ASTM D2270


Density @ 15.6 C, kg/l, ASTM D4052


Base Number - Xylene/Acetic Acid, mg KOH/g, ASTM D2896 (*)



(*) use of other ASTM approved solvents may yield different results 

Health and safety

Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @

All trademarks used herein are trademarks or registered trademarks of Exxon Mobil Corporation or one of its subsidiaries unless indicated otherwise.


DISA Montevideo S.A. - San Fructuoso, 927, Montevideo - Centro Técnico (598) 22009920 interno 55175, en caso de derrames

(598) 22007185.

Typical Properties are typical of those obtained with normal production tolerance and do not constitute a specification.  Variations that do not affect product performance are to be expected during normal manufacture and at different blending locations.  The information contained herein is subject to change without notice. All products may not be available locally. For more information, contact your local ExxonMobil contact or visit
ExxonMobil is comprised of numerous affiliates and subsidiaries, many with names that include Esso, Mobil, or ExxonMobil. Nothing in this document is intended to override or supersede the corporate separateness of local entities. Responsibility for local action and accountability remains with the local ExxonMobil-affiliate entities.